Structure of water-cooling throat of high-Mach-number molded surface spray pipe for hypersonic wind tunnel

Abstract

The invention discloses a structure of a water-cooling throat of a high-Mach-number molded surface spray pipe for a hypersonic wind tunnel. The structure comprises a first water channel lining block and a second water channel lining block, wherein the first water channel lining block and the second water channel lining block are installed on the outer side of a throat inner shell and fixed to the throat inner shell through lining block connecting screws; a first outer shell and a second outer shell are combined to form the water-cooling throat section of the high-Mach-number spray pipe; the throat inner shell is an axisymmetric funnel-shaped metal cylinder; a water channel and a water channel separation rib are arranged outside the throat inner shell; and bosses used for sealing are arranged on the outer side faces of cylindrical tables at the two ends of the throat inner shell respectively. The throat section of the structure is of a full-assembly structure, a welding procedure is omitted, and the influence of welding residual stress on deformation of the throat section in the using process is eliminated; and the throat inner shell can be replaced, the maintenance cost after damage in the using process is reduced, the later machining period is shortened, and high-pressure and high-temperature sealing is reliable.

Description

technical field [0001] The invention relates to the field of hypersonic wind tunnel test equipment, in particular to a structure for a water-cooled throat of a high Mach number surface nozzle in a hypersonic wind tunnel. Background technique [0002] The profile nozzle is the core component of the hypersonic wind tunnel, and it is an important part of the wind tunnel to ensure a certain Mach number and a certain uniformity of airflow. After being rectified by the stable section, the wind tunnel airflow enters the constriction section, which gradually accelerates the airflow from subsonic speed to sonic speed, and then starts from the throat of the nozzle, the airflow accelerates through expansion, and reaches a given Mach number at the nozzle outlet. Given a certain ratio of the throat area to the nozzle outlet area of ​​the nozzle, only the corresponding Mach number can be obtained. Maintaining the shape of the inner profile of the nozzle is an important factor to obtain th...

AI Technical Summary

Problems solved by technology

Therefore, the materials used to manufacture the throat section of the nozzle must first have high strength, good processing performance, and good thermal conductivity. Materials with the above properties generally cannot be used at high temperatures if cooling measures are not considered. Under long-term use

If the cooling structure is improper, problems such as ablation and deformation of the throat inner shell material will occur during operation, resulting in uneven distribution of the Mach number at the nozzle outlet, and the flow field performance index will not meet the requirements of the relevant national military standards, and it will not be possible to invest in For aircraft model ground test research applications, the nozzle throat section needs to be scrapped and put into production again

[0005] At present, the throat section of most high Mach number nozzles adopts the structure of copper alloy and stainless steel vacuum diffusion welding. This structure has complex manufacturing process, high precision requirements of diffusion welding tooling, long processing cycle and high cost. Diffusion welding During the process, the water channel is likely to be crushed and collapsed, which reduces the cooling effect, and the inner shell of the throat cannot be replaced after being damaged, resulting in the scrapping of the entire throat section and the need for re-feeding and processing.

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